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Citrix 1Y0-241: What does administrator need to do to ensure Citrix ADCs still handle web traffic when nodes become unavailable or fail health check

By: Author Alex Lim

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Question

A Citrix Administrator is configuring a Citrix ADC high availability (HA) pair. The administrator needs to ensure that one Citrix ADC is UP and primary at all times to guarantee that business websites are always available. In the event that both nodes become unavailable or fail a health check, what does the administrator need to do to ensure that the Citrix ADCs still handle web traffic?

A. Configure HA fail-safe mode on the primary Citrix ADC only.
B. Disable HA fail-safe mode on each Citrix ADC independently.
C. Configure HA fail-safe mode on each Citrix ADC independently.
D. Disable HA fail-safe mode on the primary Citrix ADC only.

Answer

C. Configure HA fail-safe mode on each Citrix ADC independently.

Explanation

The answer is C. Configure HA fail-safe mode on each Citrix ADC independently.

HA fail-safe mode ensures that one node is always primary even when both nodes fail the health check. This is to ensure that when a node is only partially available, backup methods are enabled to handle traffic as best as possible.

To configure fail-safe mode, the administrator would follow these steps:

  1. Go to System > High Availability.
  2. On the Nodes tab, select the node that you want to configure fail-safe mode on.
  3. Under Fail-Safe Mode, select the Maintain one Primary node even when both nodes are unhealthy option.
  4. Click the Apply button.

Once fail-safe mode has been configured on both nodes, in the event that both nodes fail the health check, the node that failed last will become the primary node. This will ensure that web traffic is still handled even though both nodes are unavailable.

The other options are incorrect.

Option A: Configuring HA fail-safe mode on the primary Citrix ADC only will not ensure that one node is always primary. If the primary node fails, the secondary node will become the primary node, but if the secondary node also fails, then there will be no primary node and web traffic will not be handled.

Option B: Disabling HA fail-safe mode on each Citrix ADC independently will not ensure that one node is always primary. If both nodes fail the health check, then there will be no primary node and web traffic will not be handled.

Option D: Disabling HA fail-safe mode on the primary Citrix ADC only will not ensure that one node is always primary. If the primary node fails, the secondary node will become the primary node, but if the secondary node also fails, then there will be no primary node and web traffic will not be handled.

Reference

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